US3754564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for a central suction system
Assignee: Envac Centrlasug AB
•
Filing: 1972-01-03
•
Granted: 1973-08-28
•
Expires: 1992-01-03
Abstract
Abstract In a system of the type of a central vacuum cleaner system having a plurality of connection boxes for selective connection of suction implements by insertion of a connector in one such box, a normally closed valve disposed within the box. This valve has a valve flap adapted to by swung into opening position within the box by engagement with the connector during insertion thereof. The valve flap has a concave outer surface and at least one shoulder contacting the forward end of the connector at a position spaced from the pivotal point of the flap.
Inventors
- 👤 P Naumburg
- 👤 J Norrman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:30
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/20; F16K1/2014; F16L; F16L29/00; F16L29/007; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6966; Y10T137/6969; Y10T137/698
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
202 words
A valve for closing an insertion duct for a connector in a built-in connection box in relation to a conduit communicating with the duct in said box and forming a part of a central suction system, said valve comprising a valve flap positioned in the path of insertion of the connector into the duct and pivoted within the box laterally of the insertion path, said flap being biased, against the action of a reduced pressure prevailing in the duct, from the interior of the duct outwardly into a final position in closing and sealing abutment against a seat surrounding an insertion opening for the connector, characterized in that said valve flap has an edge portion corresponding to said seat, that within said edge portion said valve flap is concave on its surface facing outwardly from the duct and that said valve flap is provided with two shoulders symmetrically provided on either side of the pivot point and extending from said edge portion within the plane of the seat into the insertion path of the connector to come into force-transmitting engagement with a forward portion of the connector during a considerable part of the inserting movement of the connector through the insertion opening.
Claim 2
Dependent Claim
202 words
A valve for closing an insertion duct for a connector in a built-in connection box in relation to a conduit communicating with the duct in said box and forming a part of a central suction system, said valve comprising a valve flap positioned in the path of insertion of the connector into the duct and pivoted within the box laterally of the insertion path, said flap being biased, against the action of a reduced pressure prevailing in the duct, from the interior of the duct outwardly into a final position in closing and sealing abutment against a seat surrounding an insertion opening for the connector, characterized in that said valve flap has an edge portion corresponding to said seat, that within said edge portion said valve flap is concave on its surface facing outwardly from the duct and that said valve flap is provided with two shoulders symmetrically provided on either side of the pivot point and extending from said edge portion within the plane of the seat into the insertion path of the connector to come into force-transmitting engagement with a forward portion of the connector during a considerable part of the inserting movement of the connector through the insertion opening.
Claim 3
Dependent Claim
21 words
The valve as claimed in claim 1 in which the shoulders are spaced from the pivot point of the valve flap.
Claim 4
Dependent Claim
29 words
The valve as claimed in claim 2 in which the shoulders are disposed between the pivot point and the diametrically opposed position and more closely to the latter position.
Claim 5
Dependent Claim
36 words
The valve as claimed in claim 1 in which the shoulders form the end portions of a ridge which mutually delimits two concave depressions in the side of the valve flap facing outwardly from the duct.
Claim 6
Dependent Claim
36 words
The valve as claimed in claim 4 in which the depression situated more closely to the pivot point comprises a greater portion of the surface of the valve flap within edge portion than the other depression.
Claim 7
Dependent Claim
62 words
The valve as claimed in claim 4 in which the ridge has such a curvature that in the open position to which valve flap has been moved by the insertion of the connector the ridge extends concentrically or, viewed in the inserting direction of the connector, parallel to a corresponding edge portion of the inserting opening for the connector in the seat.
Claim 8
Dependent Claim
78 words
The valve as claimed in claIm 4 in which within the range of the concave depression disposed at a greater distance from the pivot point both the edge portion of the valve flap and the corresponding portion of the seat starting from the shoulders are more inclined towards the interior of the duct in than the sections of the edge portion and the seat within the range of the concave depression disposed more closely to the pivot point.
Claim 9
Dependent Claim
65 words
The valve as claimed in claim 1 in which said concave depression adjacent the pivot point has such a shape that at least during a considerable part of the inserting movement of a connector having a forward edge positioned in a plane perpendicular to the path of insertion a force-transmitting engagement between said forward edge and the valve flap substantially only exists at the shoulders.
Claim 10
Dependent Claim
98 words
The valve as claimed in claim 1 in which for use in a box having the shape of a tube which at the end facing outwardly from the duct is provided with a flange radially extending from the tube opening, said valve comprising a mounting plate adapted to be attached on the outer surface of said flange and bounding the insertion opening at an annular seat, the valve flap being journalled on the inner surface of said mounting plate for swinging displacement on a shaft extending in a plane perpendicular to the direction of insertion of the connector.
Claim 11
Dependent Claim
68 words
The valve as claimed in claim 9 in which the valve flap has a journal portion extending exteriorly of the edge portion corresponding to the seat, said shaft extending through said journal portion in a plane perpendicular to the direction of insertion of the connector and being supported on either side of the journal portion in the side of the mounting plate facing the interior of the box.
Claim 12
Dependent Claim
34 words
The valve as claimed in claim 9 in which means biasing the valve flap against the seat are provided on the side of mounting plate facing the interior of box adjacent said journal portion.
References Cited (Backward Citations)
US3127148A
Cited
US756582A
Cited
US2601339A
Cited
US2630131A
Cited
US2789838A
Cited
US3036601A
Cited
US3468334A
Cited
US3580414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |